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OK then its just

RX <-- TX
TX --> RX

Though polarity may be either way
Mesa uses the EIA-RS-422/423 standard
where RX+ and TX+ are the inverted data
(for compatibility with RS-423/RS-232)

use the 'not' hal component:
linuxcnc.org/docs/html/man/man9/not.9.html

The drive is using RS-422, and I think it operates in Full Duplex (bidirectional) mode.

Note sure, the drive shows a full duplex connection
Is it full or half duplex?

I have a lathe I would like to convert but I really don’t feel like dealing with the motor/spindle.  I know I won’t have sfm etc .   But threading…..
if i put two encoders on the spindle rpm/postion . 
can I just set the lathe to the rpm I want matching what I programmed it to and Linuxcnc will handle the timing todo single point threading ? 

thank you Peter , 
I want to confirm my understanding. Are the connections in this image correct as you mentioned, or did I misunderstand?
 
 

Wow, that's incredibly fast! Thank you!

I have LinuxCNC 2.9.3 running on Debian Bookworm installed on a decent old PC.

The latency test returned a max jitter of about 15ns for the top number and 24ns for the bottom number.

I have now removed all unnecessary hardware and peripherals.

I will also blacklist as many kernel modules as possible.

The CPU scaling governor is set to performance.

The PC communicates with the microstep drivers directly through a PCI-e parallel port card, a parallel port cable, and a PMDX-122 buffer board.

Is this latency acceptable?

Would LinuxCNC 2.714 Wheezy work better for my setup?

I will post latency test result after disabling all unnecessary hardware.

Is it worthwhile to disable the Ethernet port (blacklist e1000e) to reduce latency?

if the spindle motor is step/dir, you setup the spindle stepgen as a normal joint stepgen
except  you set the stepgen to velocity mode and connect the stepgen velocity command
to the commanded spindle speed (that step scale must me chosen to get the correct RPM)

No i dont want to use it as both A axis and spindle. I just want to use it as a Spindle. But i dont know how. The pul and dir pins of the motor need to be configured as what? Spindle CW and Spindle PWM? Where to get stepgen from? I basically need entire help on configuration so that i can make this jmc ihsv86 Servo motor as a spindle.

Hi all,

I have a simple question that I can't seem to find an answer to. I have a NC eStop switch wired up to an input on my Delta B3 drives running Ethercat. I have the following line in my Hal file for that eStop switch:

net estop-ext <= lcec.0.0.in-1-eStop

This appears to work, but has the sign backwards. (i.e. would operate fine if my eStop switch was NO instead of NC). How do I invert the sign of this input so it operates correctly with my NC switch? I found references to adding a "-not" or "_not" to the end of the input, but that isn't working, I get a variable error as it appears to be treating the "-not" as part of the variable string.

Thanks,
Callum

The timer number setup is via a parameter
probably something with "fanuc" and "timer" in it's name

Yes I have a digital oscilloscope, set it up at the machine today so that should be helpful. Looking at the pins, here's what's available.

 

Also, unsurprisingly no output from the serial port  with the current configuration.

You can run that card from a 7I92,7I92T,7I96,7I96S etc also

This is fairly easy to setup if the motor is always used as a spindle
(basically using the stepgen in velocity mode)

If you need both A Axis and spindle in the same configuration,
it's a bit more difficult to setup as the hal file needs to change
a number of connections, scaling depending on mode.